kata-runtime: add metrics command

For easier debug, let's add subcommand to kata-runtime for gathering
metrics associated with a given sandbox.

kata-runtime metrics --sandbox-id foobar

Fixes: #1815

Signed-off-by: Eric Ernst <eric_ernst@apple.com>

src/runtime/cli/kata-metrics.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2021 Apple Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+import (
+	"fmt"
+
+	kataMonitor "github.com/kata-containers/kata-containers/src/runtime/pkg/kata-monitor"
+	"github.com/kata-containers/kata-containers/src/runtime/pkg/katautils"
+	"github.com/urfave/cli"
+)
+
+var kataMetricsCLICommand = cli.Command{
+	Name:      "metrics",
+	Usage:     "gather metrics associated with infrastructure used to run a sandbox",
+	UsageText: "metrics <sandbox id>",
+	Action: func(context *cli.Context) error {
+
+		sandboxID := context.Args().Get(0)
+
+		if err := katautils.VerifyContainerID(sandboxID); err != nil {
+			return err
+		}
+
+		// Get the metrics!
+		metrics, err := kataMonitor.GetSandboxMetrics(sandboxID)
+		if err != nil {
+			return err
+		}
+
+		fmt.Printf("%s\n", metrics)
+
+		return nil
+	},
+}

src/runtime/cli/main.go

@@ -122,6 +122,7 @@ var runtimeCommands = []cli.Command{
 	kataCheckCLICommand,
 	kataEnvCLICommand,
 	kataExecCLICommand,
+	kataMetricsCLICommand,
 	factoryCLICommand,
 }